I didn't comment on whether you asked a reasonable or unreasonable question. You made a statement, that all the leagues had teams in the top 50, and you even saw some ECNL teams lower than that, implying that all leagues were equal. It was clear what you were doing, and it was just as clear for the reader to point out the actual rating/ranking of teams in the leagues.
Whether GA or ECNL will expand to the central valley probably just depends on the teams that can be developed there, and whether there are enough committed players that would join a somewhat expensive travel club team. Neither SoCal nor NorCal wants to commute for hours out there for games every weekend, so there probably has to be a nexus of enough kids and enough teams to support local play in the area. There's a push for less travel at both the NL and RL level, and I can't imagine GA parents are excited about more hours in the car (or on a plane). Anything that makes that worse is probably not a good bet, while anything that makes that better, is an improvement for any league.